Browse Prior Art Database

Selective Frequency Transmission Generator

IP.com Disclosure Number: IPCOM000095026D
Original Publication Date: 1965-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Kramer, E: AUTHOR

Abstract

The transmission of digital information from a plurality of channels over a single transmission media is achieved without the necessity of either highly stabilized oscillators or additional modulation circuitry or both. The digital information in each channel is represented by a distinct frequency signal provided by the above selective frequency transmission generator. The plurality of frequency signal outputs is multiplexed to provide transmission of the transformed digital data over a single transmission media.

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Selective Frequency Transmission Generator

The transmission of digital information from a plurality of channels over a single transmission media is achieved without the necessity of either highly stabilized oscillators or additional modulation circuitry or both. The digital information in each channel is represented by a distinct frequency signal provided by the above selective frequency transmission generator. The plurality of frequency signal outputs is multiplexed to provide transmission of the transformed digital data over a single transmission media.

In the single channel representation of a selective frequency transmission generator shown. the output a of unstabilized oscillator C is linearly swept from a lower to a higher frequency by the ramp output of ramp generator B. Trigger A activates generator B only when the digital input signal is in a 1 state. Oscillator C is not swept to transmit a digital 0. Filter E, with a transmission characteristic b, provides signal pulse output c. The flyback pulse generated during the flyback of oscillator C is attenuated by attenuator D and is negligible if the flyback time of oscillator C is less than 5% of the sweep time.

Multiplexor F couples the selective frequencies from each channel to a single transmission media.

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